/Engine/Plugins/Runtime/RigVM/Source/RigVM/Public/RigVMCore/RigVMStruct.h
Returns the name of the first variable given a type (or NAME_None if not found)
template<typename T, typename [TEnableIf](API\Runtime\Core\Templates\TEnableIf)< [TRigVMIsBaseStructure](API\Plugins\RigVM\RigVMCore\TRigVMIsBaseStructure)< T >::Value >::Type *> [FName](API\Runtime\Core\UObject\FName) FindFirstVariableOfType() const